Drop-hammer.



.H. TERHUNE.

DROP HAMMER.

APPLIOATION FILED 00117, 1908.

Patented Jan. 28, 1913.

6 SHEETSSHEET 1.

INVENTORV WITNESSES:

I A; A TTORNEY.

H. TERHUNE.

DROP HAMMER.

APPLICATION FILED 00T.17, 190a.

Patented Jan. 28, 1913.

6 SHEETS-SHEET 2.

INVEN R.

WITNESSES A; A TTORNEY.

H. TERHUNE.

DROP HAMMER.

APPLICATION FILED OCT. 17, 190B. 1,051,779. Patented Jan.28, 1913.

6 SHEETSSHBET 3.

WITNESSES E IN V EN T02. 8. [W BY I ATTORNEY.

H. TERHUNE.

DROP HAMMER.

APPLICATION FILED 001'. 17, 190B.

Patented Jan. 28, 1913.

m 6 SHEBTSSHEET 4 WITNESSES %M- ii Q IKN/IVFNTZR.

L ATTORNEY.

H. TERHUNE.

DROP HAMMER.

APPLICATION FILED 001217, 1908.

1,051,779. Patented Jan. 28, 1913.

a snnn'rs-snnm 5.

, A TTORNE Y.

; IN VEN TOR.

H. TERHUNE.

DROP HAMMER.

APPLICATION FILED 0GT.17, 190s Patented Jan. 28, 1913.

6 SHEETS-SHEET 6.

i [N V EN TOR.

WITNESSES:

g ATTORNEY.

HOWARD TERHUNE, OF HARTFORD, CONNECTICUT.

DROP-HAMMER.

Specification of Letters Patent.

Patented Jan. 28, 1913.

Application filed October 17, 1908. Serial No. 458,178.

To all whom it may concern:

Be it known that I, HOWARD TERHUNE, a citizen of the United States, anda resident of Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in Drop-Hammers, of which the following is a specification.

My invention relates to improvements in drop presses, the object of theinvention being to improve the construction of machines of this class ina number of different particulars, more especially in respect to theadjustment of the hoard-clamp, the adjustment of the hammer-raisingrolls, the securing and adjustment of the side uprights to the base, andproviding a novel manner of cutting out the automatic actuation of thehammer and controlling its movement by the foot of the operator; also inthe pro- .vision of a novel form of adjustment for the roll-releasinglever.

In the drawings-Figure 1 is a side elevation of a drop hammer in whichmy invention are embodied, looking from the left of Fig. 2. Fig. 2 is afront view of a drop hammer. Fig. 3 is a side view of the same lookingfrom the right of Fig. 2. Fig. 4 is a detail view on enlarged scale ofthe head of a drop hammer. Fig. 5 -is a detail rear view on enlargedscale of the head; Fig. 6 is a sectional side elevation of the head.Fig. 7 is a side elevation partly in section showing .the attachment ofthe side upright to the base. Fig. 7 is a plan view of the base showingthe T-shaped recesses. Fig. 8 is a sectional view on the line 8-S ofFig. 7. Fig. 9 is a sectional view on the line 9-9 of Fig. 10 showingthe knock-off plug. Fig. 10 is a sectional plan view on the line 10 10of Fig. 12. Fig. 11 is a detail side elevation on enlarged scale of oneof the uprights showing the frictionbar controlling mechanism, partsbeing broken away to show construction. Fig. 12 is a front view of theparts shown in Fig. 11. Figs. 13 and 14 are detail views on enlargedscale of the adjusting device for the roll-releasing lever. Fig. 15 is asectional lan View of one of the uprights on en- 'arged scaleillustrating a modification of the friction-bar controlling mechanism.Fig. 16 is a side elevation of the same. Fig. 17 is a view looking fromthe right of Fl t6 eferring to the drawings a is the base,

width, rather than a heavy I) b the uprights mounted on and secured tothe base in a manner to be hereinafter described.

0 denotes in general the head mounted on the top of the uprights, d thehammer sliding on guides cl on the inner faces of the side uprights.

0 denotes the board to which the hammer is secured and by means of whichit is raised.

10 denotes in general the board-clamp by means of which the hammer maybe held in its raised position.

100 denotes in general the hammer-raising mechanism which comprisesrolls movable toward and away from each other, and adapted to engage theboard 6 to raise the hammer in the usual manner.

Referring now more particularly. to Figs. 1, 2, 3, 4, 5 and 6 of thedrawings I desire to call attention to one feature of my invention,namely, the means which I have provided for adjusting the board-clamp.As will be seen the board-clamp is arranged above the raising rolls. Itcomprises in detail a pair of clamping members 11, 12, provided withhubs, 13, '14:, which fit eccentrics 15, 16 on shafts 17, 18. To theshaft 17 there is connecteda lever 19 which is connected with thetreadle 20 by the bar 21. As will be seen, when the treadle is presseddown the eccentric is rotated, moving the clamp 11 away from the clamp12, releasing the board so that the hammer may drop in the well knownmanner. on which the eccentric 16 is mounted a lever 22 is securedhaving connected to its end an adjusting bar 23 which passes down to therear of one of the side uprights, (the left hand upright lookingmachine), with its end passing through a lug 24, nuts 25 being threadedonto said bar 23 above and below said lug 24 in order to provide foradjusting the bar. These boardclamps have a heavy duty to perform asthey must grip the board with sufficient force to sustain the weight ofthe hammer when the machine is being operated by the treadle. It oftenbecomes necessary to ad- To the shaft 18 from the front of the justthese clamps so that they will grip the board firmly. These boards varyin width from seven to twelve important that the clamps shall always beparallel with each get an even grip on the board throughout 1ts gripatone side inches and it is,

other so that they will and a light grip at theother side, which tendsto splinter the board and damage it.

allelism with the base of the clamp 11 and V the adjustment of theclamps can be readily accomplished from the floor by manipulation of thenuts 25 or some equivalent device. The eccentric 15 is used solely formoving the clamp 11; back to release the board and allow the hammer todrop, it being operated by the treadle 20 as described. The eccentric 16is utilized to adjust the clamp 12 toward and, away from the clamp 11tovary the gripping effect of the clamps on the board. It is also oftennecessary to adjust the raising-rolls toward or away from each other andI accomplish this in a manner similar to the adjustment of the clamps.The rolls are indicated at 101, 110, mounted on shafts 102, 112, whichshafts aremounted in eccentric bushings 103, 113.- The roll 101 isactuated by the friction bar. 50 in the usual manner forautomatically-raising the hammer after it has dropped. The roll 110 isthe roll which is adjusted toward or away from the roll 101, theeccentric 113 having secured to, it

a lever 114 having attachedto' its enda' bar 115 which extends down atthe rear of 'the right hand upright (looking from the front ,of themachine), its end passing through a lug 116,-adjusting nuts 117 be ingthreaded onto the bar above and below said lug in order to lock the bar,lever and roll 110 in adjusted position. This eccentrio adjustment forthe roll insures that it is moved bodily toward and away from itscooperating roll 101 and if the rolls are originally set up inparallelism they are retained in that position in any position ofadjustment. The adjustment of the rolls can also be effected readilyfrom the floor.

by the manipulation of the adjusting nuts 117, making a very convenientand accurate adjustment.

Referring now to Figs. 7, 7 and 8 the manner of adjusting the sideuprights on the base will be seen. The drawings indicate oneside uprightand the same arrangement is applied to both. The device will bedescribed with reference to one side upright only. As seen in the planview of Fig. 7 the top of the base under the side upright is grooved asat 40, this groove being enlarged at its inner end as at41 formingshoulders 42. As seen in Figs. 7

and 8 there is an upstanding rib 43' centrally in this groove. A bolt 44has an enlarged head 45 which fits in the enlarge- -ment 41 of thegroove and rests against the shoulders 42. This bolt is supported on therib 43. The upright rests on the base as 'indicated and has tongueswhich fit down into the groove 40, straddling the bolt, and a dependingrib 46 which rests on the bolt.

The bolt extends outside of the base and is provided with a nut 47 whichbears against the side of the upright. The usual basebinding bolts 48pass through the upright into the base in order .to hold theupright backagainst the nut 47. The strain to which these uprights are subjected dueto the blow of the hammer is exerted on the nut 47. and transferred tothe head of the bolt 45 which engages the shoulders 42 in the base. Itwill be seen that the bolt 44 is always under tension, which preventsany upsetting or jamming or breaking of any fitted part. inside of thebase, as very often happens in the adjusting devices which are atpresentused.v

I have illustrated a usual form of friction-bar by which one of theraising rolls is thrown into and out of engagement with the board. Thisfriction-bar is indicated at 50 and is connected atits upper end withone ofthe rolls 1.01, which roll can swing so as to be engaged with ordisengaged from the board 6. WVhen the friction-bar is in its raisedposition the roll is disengaged from the board; when the friction-bardrops it throws the roll into engagement with the board, and this rollwith its cooperating roll 110 grips the board and raises thehammer. Whenthe hammer reaches its top position the pin engages the end of theroll-releasing lever 70, raising the friction-bar and swinging the roll101 away from the board; the clamps 10 hold the hammer in raisedposition. The frictionbar 50 and the stoppin 52, which is secured to thefriction-bar by the dog 51, are raised sufiiciently to permit theknock-off plug 55 to be thrown for ward under the end of the stop-pin,as illustrated in Fig. 9, thus holding the frictionbar in raisedposition. \Vhen the clamps 10 are released by pressure on the main.treadle 20 the hammer drops and at the proper moment strikes the end ofthe knock-off plug 55, driving it rearwardly until the opening 57through the plug comes under the stop-pin 52. This permits thefrictionand it is possible with a hammer weighing many hundred pounds tostrike very light blows and to graduate the force and frequency of theblows in any way desired. I have provided a novel mechanism for such adirect control of the hammer by the operator. In Figs. 1, 2 and 3 thegeneral application of this device to a hammer is illustrated and itwill be seen from an examination of these figures that in addition tothe main treadle 20, which operates the clamps 10, I utilize anauxiliary treadle 20 which controls the friction-bar. This treadle 20 isshorter than the main treadle 20; its front bar overlies the maintreadle so that if desired the main treadle can be moved without movingthe auxiliary treadle. The auxiliary treadle has a projection 20 fromits front bar which overlies the front bar of the main treadle 20 sothat the operator by placing his foot on this projection 20" can operateboth treadles in unison, the spring 20 secured at one end to a stud 20and with its other end bearing against the under side of the maintreadle 2O returning them in unison to their normal positions. Thisauxiliary treadle 20 is connected by the link 20 with a lever 60- whichis pivoted in the upright, as more clearly appears in Fig. 11 of thedrawings. Referring now to Figs. 9, 10, 11 and 12, it will be seen thatthe knockofl plug has a depending stud 61 with a beveled surface 61. Theforward end of the lever 60 is apertured as at 62 to receive this stud61, one side of this aperture engaging the beveled face 61 of the studso that when the auxiliary treadle 20' is pressed down the forward endof the lever 60 is raised and the knock-ofl plug 55 is forced rearwardlyso that the frictlon-bar 50 and stop-pin fall until the end 59 of thefriction-bar rests on the end 63 of the lever, as indicated in thedot-and-dash lines in Fig. 11.

In the normal operation of the machine the hammer is held in raisedposition by the board clamps and the raising rolls are rocked apart bythe eccentric mounting of one of them which is connected with thefriction-bar, the friction-bar being held in raised position by reasonof the fact that the stop-pin attached to its lower end rests on theknock-off plug. When it is desired to drop the hammer the treadle 20 ispressed down, releasing the board clamps. As the hammer descends itstrikes the knock-off plug, moving it to one side so as to allow thestopin and friction-bar to drop; the weight 0 this friction-bar throwsthe raising rolls into engagement with each other so that they engagethe board and raise the hammer. When the friction-bar drops the outerend of the'roll' rleasing lever drops with it. The friction-bar remainsin its dropped position while the hammer is being raised and until thepin d on the hammer engages the end of the roll'releasing lever 70. Thisraises the friction-bar and allows the knock-01f plug to be thrown tothe right by its spring until it comes under the stop pin. The raisingof the frictionbar of course separates the rolls and the board clampstake hold of the board and hold it in raised position. It is evidenttherefore that without the devices last above described the hammer mustmove up until the pin d engages the end of the rollreleasing lever inorder to raise the friction-bar before is can be dropped again. But byproviding the mechanism last above described and the use of the twotreadles it is seen that one of the treadles 20 holds the knock-off plugto the rear and allows the entire weight of the friction-bar to beconstantly carried by the 'lever 60 while the treadle 20 controls theboard clamps. It is evident-therefore that the operator can move theraising rolls apart and so disengage them from the board at any point hedesires merely by pressing the treadle 20 which raises the friction-bar;and by operating the treadles 20 and 20 together when they are in raisedposition it is clear that the friction-bar is dropped to cause thehammer to be raised. \Vhen the hammer is to be dropped both treadles arepressed down, treadle 20 raising the friction-bar so as to disengage theraising rolls from the board, and treadle 20 disengaging the boardclamps from the board, leaving the hammer entirely free to fall. It willbe seen from this description that the operator has entire control ofthe hammer by means of these two treadles which he operates with onefoot, and he can manipulate the hammer to strike any kind of a blow hedesires merely by moving the treadles in unison.

The construction is very simple and'very effective in its operation. Thedesired result is accomplished entirely with one foot, leaving theoperators hands free to perform other duties.

As has been described hereinabove the raising rolls are disengaged fromthe board by the pin d on the hammer which engages the end of theroll-releasing lever 70. It is desirable to provide an ad ustment of theposition of this roll-releasing lever so that the hammer can be raisedto any height. By reference to Fig. 2 it will be seen that this lever'70 is fulcrumed on a stud 71 which is secured to one of the uprights,and has a sleeve 72 through which the friction-bar passes and a set-nut7 3 by which the lever is secured to the friction-bar. I have provided anovel form of adjustment for the stud 71 which permits of acomparatively close adjustment, the device being illustrated in detailin Figs. 13 and 14. The

upri ht b. is transversely grooved as at b and 'as a T-slot b in whichthe head of the bolt 74; is located. On this bolt is locatedthe stud 71having a base 75 having a projection 76 from its rear side which isadapted to fit in the transverse grooves 7) in the upright. This stud isheld on the bolt 74 in any suitable way, as by the nut 77, and can beturned on the bolt so as to rights located thereon, T-shaped recesses.ln

cause the projection 76 to engage the groove which is above or below thestud.

Fig. 13 shows the projection 76 in engagement with a groove below thestud while Fig. let shows it in engagement with a groove above the stud.By making this stud rotatable on the bolt -I am enabled to get a muchfiner adjustment than is at present possible.

Figs. 15, 16 and 17 show a modification of the devices illustrated inFigs. 9, 10, 11 and 12, for holding the knock-off plug to the rear whilethe hammer is being con-' trolled by the two treadles 20, 20 To the rearof the knock-off plug 550 is secured a laterally extending pin 610 whichis adapted to be engaged by a'cam surface 620 projecting from the lever600. The forward end630 of the lever being shaped to receive the end ofthe friction bar the results obtained are substantially the same as withthe devices shown in Figs. 9 to 12, inclusive, but the construction ismuch simpler and at the present time a preferred form.

I am aware that the inventions as described herein are subject tomodifications and alterations in details and I desire to include hereinall such modifications as come within the scope of the claims.

I claim:

1. In a drop hammer a base, side uprights located thereon, T-shapedrecesses in each base under said side uprights, a bolt having its headlocated in the enlarged part of each recess, tongues on. each uprightstraddling each bolt, and a nut threaded onto the end of each bolt andbearing against the side of said upright.

In a drop hammer a base, side upsaid base beneath said uprights, a bolthaving its head located in the enlargement in each recess, an upstandingrib to support the body of each bolt, depending tongues on said uprightstraddling said bolts, a depending rib on each upright engaging the bodyof each bolt, and a nut threaded onto the end of said bolt and engagingthe side of each upright for the purpose of adjusting saiduprightstransversely' of the base, substantially as described.

3. The combination with the knock-off plug and friction bar of a drophammer mechanism, of a lever having operative engagement with saidknock-ofi' plug to hold it in its rearward position, the forward end Iof said lever constructed and arranged to Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

